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Continuity mistake: Archangel's alumni status (or lack thereof) with the X-Men varies throughout the series. Later episodes showed him to be an original member of the team just like in the comics, yet when he first appeared in Season 1, none of the other original members in the show (Cyclops, Jean Grey and Professor X) seem to know who he is. The time traveling mutant Shard also states in Season 4 that he is destined to eventually join the X-Men.

Deliberate mistake: There's at least two episodes (Season 1's "Captive Hearts" and Season 4's "Sanctuary, Part 1") in which a character shows video footage of the X-Men and various supporting characters in action, but the footage is merely clips from previous episodes.